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How should society deal with psychopaths? What do we do with violent offenders such as rapists and serial killers? Adrian Raine, a psychologist who moved from his job at a high-security prison to the University of Southern California, believes that for a small minority, violence is not a matter of choice. Their biology prevents them from following the same moral code as the rest of us. So is it right to judge them by the same standards as the rest of society? Alison Motluk caught up with the man who thinks such offenders should be spared the death penalty…